We advise startups to launch when they’ve added a quantum of utility: when there is at least some set of users who would be excited to hear about it, because they can now do something they couldn’t do before.

Along similar lines, here’s a bit of sage advice from longtime DF reader Don O’Shea, who teaches optical engineering at Georgia Tech:

The mnemonic that I give my students for setting priorities for features in an optical design
is NUN: Necessary, Useful, and Nice.